Fix bgColor prop typo, Add demo

Author: robbinjohansson

README.md

@@ -5,7 +5,7 @@
 # Vue-scroll-indicator
 Scroll indicator component using Vue.js.
 
-<img src="https://thumbs.gfycat.com/DefiniteHardBubblefish-size_restricted.gif" width="100%" />
+[Live Demo](https://robbinfellow.github.io/vue-scroll-indicator/)
 
 ## Installation
 ```shell

src/components/VueScrollIndicator.vue

@@ -28,7 +28,7 @@ export default {
         bgColor: {
             type: String,
             default: '#eaeaea',
-            required: true
+            required: false
         },
         indicatorColor: {
             type: String,